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Geigerite

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Geigerite

Monte Nero Mine, Rocchetta Vara, La Spezia Province, Liguria, Italy
Geigerite

Monte Nero Mine, Rocchetta Vara, La Spezia Province, Liguria, Italy
Geigerite

Monte Nero Mine, Rocchetta Vara, La Spezia Province, Liguria, Italy
Geigerite

Monte Nero Mine, Rocchetta Vara, La Spezia Province, Liguria, Italy
Geigerite

Monte Nero Mine, Rocchetta Vara, La Spezia Province, Liguria, Italy
Geigerite

Monte Nero Mine, Rocchetta Vara, La Spezia Province, Liguria, Italy
Geigerite

Monte Nero Mine, Rocchetta Vara, La Spezia Province, Liguria, Italy
Geigerite

Monte Nero Mine, Rocchetta Vara, La Spezia Province, Liguria, Italy
Thomas Geiger (1920 - 1990)
Formula:
Mn52+(AsO4)2(HAsO4)2 · 10H2O
System:
Triclinic
Hardness:
3
Name:
Named after Dr. Thomas Geiger (1920 - 1990), Swiss mineralogist and metallurgist in the machinery industry and specialist for the manganese ores and minerals of Falotta and Alp Parsettens to which he devoted his PhD thesis and a series of later studies.
The manganese analogue of chudobaite.


Classification of Geigerite

IMA status:
Approved
Approval Year:
1985
Strunz 8th ed.:
7/C.06-60
Nickel-Strunz 10th (pending) ed.:
8.CE.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
Dana 8th ed.:
39.2.6.2

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
Hey's CIM Ref.:
20.8.10

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn

Physical Properties of Geigerite

Hardness (Mohs):
3

Optical Data of Geigerite

Type:
Biaxial (-)
RI values:
nα = 1.601 nβ = 1.630 nγ = 1.660
2V:
Measured: 89° , Calculated: 88°
Max Birefringence:
δ = 0.059
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of Geigerite

Formula:
Mn52+(AsO4)2(HAsO4)2 · 10H2O
IMA Formula:
Mn52+(AsO4)2(AsO3OH)2 · 10H2O
Elements listed in formula:
As, H, Mn, O - search for minerals with similar chemistry

Crystallography of Geigerite

Crystal System:
Triclinic
Cell Parameters:
a = 7.94 Å, b = 10.69 Å, c = 6.77 Å
α = 80.97°, β = 84.2°, γ = 81.85°
Ratio:
a:b:c = 0.743 : 1 : 0.633
Unit Cell Volume:
V 560.3 ų
X-Ray Powder Diffraction Data:
d-spacingIntensity
10.45 (100)
7.85 (13)
3.507 (21)
3.340 (20)
3.051 (24)
3.011 (17)
2.786 (14)

Type Occurrence of Geigerite

Type Locality:
Falotta, Tinizong (Tinzen), Oberhalbstein (Surses; Sursass), Albula Valley, Grischun (Grisons; Graubünden), Switzerland

Relationship of Geigerite to other Species

Member of:
Ondrušite Group > Lindackerite Supergroup
Other Members of Group:
Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O
KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2O
OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2O
Related Minerals - Nickel-Strunz Grouping):
8.CE.XBabánekiteCu3(AsO4)2 · 8H2O
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O
8.CE.10NewberyiteMg(HPO4) · 3H2O
8.CE.15BrassiteMg(HAsO4) · 4H2O
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2O
8.CE.20RößleriteMg(HAsO4) · 7H2O
8.CE.25MetaswitzeriteMn3(PO4)2 · 4H2O
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2O
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2O
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2O
8.CE.35BobierriteMg3(PO4)2 · 8H2O
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2O
8.CE.40ArupiteNi3(PO4)2 · 8H2O
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2O
8.CE.40ErythriteCo3(AsO4)2 · 8H2O
8.CE.40FerrisymplesiteFe33+(AsO4)2(OH)3 · 5H2O
8.CE.40HörnesiteMg3(AsO4)2 · 8H2O
8.CE.40KöttigiteZn3(AsO4)2 · 8H2O
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
8.CE.40ParasymplesiteFe32+(AsO4)2 · 8H2O
8.CE.40VivianiteFe32+(PO4)2 · 8H2O
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2O
8.CE.45SymplesiteFe32+(AsO4)2 · 8H2O
8.CE.50CattiiteMg3(PO4)2 · 22H2O
8.CE.55KoninckiteFe3+PO4 · 3H2O
8.CE.60KaňkiteFeAsO4 · 3.5H2O
8.CE.65SteigeriteAl(VO4) · 3H2O
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2O
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2O
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2O
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2O
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2O
8.CE.80SantabarbaraiteFe33+(PO4)2(OH)3 · 5H2O
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)
Related Minerals - Hey's Index Grouping:
20.8.1SarkiniteMn22+(AsO4)(OH)
20.8.2EveiteMn22+(AsO4)(OH)
20.8.3ArsenoclasiteMn52+(AsO4)2(OH)4
20.8.4FlinkiteMn22+Mn3+(AsO4)(OH)4
20.8.5JarosewichiteMn32+Mn3+(AsO4)(OH)6
20.8.6AllactiteMn72+(AsO4)2(OH)8
20.8.7KrautiteMn(HAsO4) · H2O
20.8.8SynadelphiteMn92+(As5+O4)2(As3+O3)(OH)9 · 2H2O
20.8.9SterlinghilliteMn3(AsO4)2 · 4H2O
20.8.11Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2O
20.8.12Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
20.8.13FluckiteCaMn2+(HAsO4)2 · 2H2O
20.8.14BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
20.8.15ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
20.8.16WallkilldelliteCa2Mn32+(AsO4)2(OH)4 · 9H2O
20.8.17Berzeliite(NaCa2)Mg2(AsO4)3
20.8.18ManganberzeliiteNaCa2Mn22+(AsO4)3
20.8.19Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6
20.8.20VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O
20.8.21Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23
20.8.22GrischuniteNaCa2Mn52+Fe3+(AsO4)6 · 2H2O

Other Names for Geigerite

Synonyms:

IMA1985-028

Name in Other Languages:
German:Geigerit
Spanish:Geigerita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Geigerite

Reference List:
Graeser, S.; Schwander, H.; Bianchi, R.; Pilati, T.; Gramaccioli, C. M. (1989): Geigerite, the manganese analogue of chudobaite: Its description and crystal structure. American Mineralogist: 74, 676-684.

Internet Links for Geigerite

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https://www.mindat.org/min-1669.html
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    • Localities for Geigerite

    This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Italy
     
    • Liguria
      • La Spezia Province
        • Rocchetta Vara
    		Cabella, R., Basso, R., Lucchetti, G., Palenzona, A. (2000): Geigerite from Mt. Nero manganese mine (Northern Appennines, La Spezia, Italy). Neues Jahrbuch für Mineralogie, 12, 570-576.
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Fukushima Prefecture
          • Iwaki City
    		Kato et al (1990) Ganseki-Koubutsu-Koshogaku Zasshi, 85, 184.; Mineralogical Journal Vol. 18 (1996) , No. 4 pp 155-160
    Romania
     
    • Hunedoara Co.
      • Deva
    		Collected by Gábor Koller, XRD and EDS: Sándor Szakáll and Béla Fehér
    Saudi Arabia
     
    • Mintaqah Al Madinah
    		Faheha, A. A., Hamidalddin, S. Q., Al-Turkestany, N. A., & Ibraheim, N. M. (2012). Concentrations Of Natural And Man-Made Radioactivity Of Surface Soil In Al-Madinh Al-Monawarah, Western Province of Saudi Arabia. Isotope and Radiation Research, 44(2), 495-504.
    Switzerland (TL)
     
    • Grischun (Grisons; Graubünden)
      • Albula Valley
        • Oberhalbstein (Surses; Sursass)
          • Tinizong (Tinzen)
    		Amer.Mineralogist 74, pages 676 - 684.
      • Hinterrhein Valley
        • Rheinwald
          • Splügen
    		Raman & EDX through AMI identificaton service. Found in 2010 by Claudio Leporatti; pers. comm. Roberto Bracco (2015)
    Mineral and/or Locality  
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